SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd95a74a974995fcd573c29b23373d67c096514cb163f429b80713ad8344f354' 
  AND token = 'J5YMeHWDlUAn3q5BKLXjVVttnRS78KbMhgKbPJ9+Vss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}